package morenoapp.util;

import java.io.*;
import java.util.*;
import java.net.*;

/**
 * A simple, tiny, nicely embeddable HTTP 1.0 server in Java
 *
 * <p> NanoHTTPD version 1.11,
 * Copyright &copy; 2001,2005-2008 Jarno Elonen (elonen@iki.fi, http://iki.fi/elonen/)
 *
 * <p><b>Features + limitations: </b><ul>
 *
 *    <li> Only one Java file </li>
 *    <li> Java 1.1 compatible </li>
 *    <li> Released as open source, Modified BSD licence </li>
 *    <li> No fixed config files, logging, authorization etc. (Implement yourself if you need them.) </li>
 *    <li> Supports parameter parsing of GET and POST methods </li>
 *    <li> Supports both dynamic content and file serving </li>
 *    <li> Never caches anything </li>
 *    <li> Doesn't limit bandwidth, request time or simultaneous connections </li>
 *    <li> Default code serves files and shows all HTTP parameters and headers</li>
 *    <li> File server supports directory listing, index.html and index.htm </li>
 *    <li> File server does the 301 redirection trick for directories without '/'</li>
 *    <li> File server supports simple skipping for files (continue download) </li>
 *    <li> File server uses current directory as a web root </li>
 *    <li> File server serves also very long files without memory overhead </li>
 *    <li> Contains a built-in list of most common mime types </li>
 *    <li> All header names are converted lowercase so they don't vary between browsers/clients </li>
 *
 * </ul>
 *
 * <p><b>Ways to use: </b><ul>
 *
 *    <li> Run as a standalone app, serves files from current directory and shows requests</li>
 *    <li> Subclass serve() and embed to your own program </li>
 *    <li> Call serveFile() from serve() with your own base directory </li>
 *
 * </ul>
 *
 * See the end of the source file for distribution license
 * (Modified BSD licence)
 */
public class Httpd {
    // ==================================================
    // API parts
    // ==================================================
    /**
     * Override this to customize the server.<p>
     *
     * (By default, this delegates to serveFile() and allows directory listing.)
     *
     * @parm uri	Percent-decoded URI without parameters, for example "/index.cgi"
     * @parm method	"GET", "POST" etc.
     * @parm parms	Parsed, percent decoded parameters from URI and, in case of POST, data.
     * @parm header	Header entries, percent decoded
     * @return HTTP response, see class Response for details
     */
    public Response serve(String uri, String method, Properties header, Properties parms) {
        System.out.println(method + " '" + uri + "' ");

        Enumeration e = header.propertyNames();
        while (e.hasMoreElements()) {
            String value = (String) e.nextElement();
            System.out.println("  HDR: '" + value + "' = '" +
                    header.getProperty(value) + "'");
        }
        e = parms.propertyNames();
        while (e.hasMoreElements()) {
            String value = (String) e.nextElement();
            System.out.println("  PRM: '" + value + "' = '" +
                    parms.getProperty(value) + "'");
        }

        return serveFile(uri, header, new File("."), true);
    }

    /**
     * HTTP response.
     * Return one of these from serve().
     */
    public class Response {
        /**
         * Default constructor: response = HTTP_OK, data = mime = 'null'
         */
        public Response() {
            this.status = HTTP_OK;
        }

        /**
         * Basic constructor.
         */
        public Response(String status, String mimeType, InputStream data) {
            this.status = status;
            this.mimeType = mimeType;
            this.data = data;
        }

        /**
         * Convenience method that makes an InputStream out of
         * given text.
         */
        public Response(String status, String mimeType, String txt) {
            this.status = status;
            this.mimeType = mimeType;
            this.data = new ByteArrayInputStream(txt.getBytes());
        }

        /**
         * Adds given line to the header.
         */
        public void addHeader(String name, String value) {
            header.put(name, value);
        }
        /**
         * HTTP status code after processing, e.g. "200 OK", HTTP_OK
         */
        public String status;
        /**
         * MIME type of content, e.g. "text/html"
         */
        public String mimeType;
        /**
         * Data of the response, may be null.
         */
        public InputStream data;
        /**
         * Headers for the HTTP response. Use addHeader()
         * to add lines.
         */
        public Properties header = new Properties();
    }
    /**
     * Some HTTP response status codes
     */
    public static final String HTTP_OK = "200 OK",
            HTTP_REDIRECT = "301 Moved Permanently",
            HTTP_FORBIDDEN = "403 Forbidden",
            HTTP_NOTFOUND = "404 Not Found",
            HTTP_BADREQUEST = "400 Bad Request",
            HTTP_INTERNALERROR = "500 Internal Server Error",
            HTTP_NOTIMPLEMENTED = "501 Not Implemented";
    /**
     * Common mime types for dynamic content
     */
    public static final String MIME_PLAINTEXT = "text/plain",
            MIME_HTML = "text/html",
            MIME_DEFAULT_BINARY = "application/octet-stream";

    // ==================================================
    // Socket & server code
    // ==================================================
    /**
     * Starts a HTTP server to given port.<p>
     * Throws an IOException if the socket is already in use
     */
    public Httpd(int port) throws IOException {
        myTcpPort = port;

        final ServerSocket ss = new ServerSocket(myTcpPort);
        Thread t = new Thread(new Runnable() {
            public void run() {
                try {
                    while (true) {
                        new HTTPSession(ss.accept());
                    }
                } catch (IOException ioe) {
                }
            }
        });
        t.setDaemon(true);
        t.start();
    }

    /**
     * Starts as a standalone file server and waits for Enter.
     */
    public static void main(String[] args) {
        System.out.println("NanoHTTPD 1.11 (C) 2001,2005-2008 Jarno Elonen\n" +
                "(Command line options: [port] [--licence])\n");

        // Show licence if requested
        int lopt = -1;
        for (int i = 0; i < args.length; ++i) {
            if (args[i].toLowerCase().endsWith("licence")) {
                lopt = i;
                System.out.println(LICENCE + "\n");
            }
        }

        // Change port if requested
        int port = 80;
        if (args.length > 0 && lopt != 0) {
            port = Integer.parseInt(args[0]);
        }

        if (args.length > 1 &&
                args[1].toLowerCase().endsWith("licence")) {
            System.out.println(LICENCE + "\n");
        }

        Httpd nh = null;
        try {
            nh = new Httpd(port);
        } catch (IOException ioe) {
            System.err.println("Couldn't start server:\n" + ioe);
            System.exit(-1);
        }
        nh.myFileDir = new File("");

        System.out.println("Now serving files in port " + port + " from \"" +
                new File("").getAbsolutePath() + "\"");
        System.out.println("Hit Enter to stop.\n");

        try {
            System.in.read();
        } catch (Throwable t) {
        }
        ;
    }

    /**
     * Handles one session, i.e. parses the HTTP request
     * and returns the response.
     */
    private class HTTPSession implements Runnable {
        public HTTPSession(Socket s) {
            mySocket = s;
            Thread t = new Thread(this);
            t.setDaemon(true);
            t.start();
        }

        public void run() {
            try {
                InputStream is = mySocket.getInputStream();
                if (is == null) {
                    return;
                }
                BufferedReader in = new BufferedReader(new InputStreamReader(is));

                // Read the request line
                StringTokenizer st = new StringTokenizer(in.readLine());
                if (!st.hasMoreTokens()) {
                    sendError(HTTP_BADREQUEST, "BAD REQUEST: Syntax error. Usage: GET /example/file.html");
                }

                String method = st.nextToken();

                if (!st.hasMoreTokens()) {
                    sendError(HTTP_BADREQUEST, "BAD REQUEST: Missing URI. Usage: GET /example/file.html");
                }

                String uri = st.nextToken();

                // Decode parameters from the URI
                Properties parms = new Properties();
                int qmi = uri.indexOf('?');
                if (qmi >= 0) {
                    decodeParms(uri.substring(qmi + 1), parms);
                    uri = decodePercent(uri.substring(0, qmi));
                } else {
                    uri = decodePercent(uri);
                }


                // If there's another token, it's protocol version,
                // followed by HTTP headers. Ignore version but parse headers.
                // NOTE: this now forces header names uppercase since they are
                // case insensitive and vary by client.
                Properties header = new Properties();
                if (st.hasMoreTokens()) {
                    String line = in.readLine();
                    while (line.trim().length() > 0) {
                        int p = line.indexOf(':');
                        header.put(line.substring(0, p).trim().toLowerCase(), line.substring(p + 1).trim());
                        line = in.readLine();
                    }
                }

                // If the method is POST, there may be parameters
                // in data section, too, read it:
                if (method.equalsIgnoreCase("POST")) {
                    long size = 0x7FFFFFFFFFFFFFFFl;
                    String contentLength = header.getProperty("content-length");
                    if (contentLength != null) {
                        try {
                            size = Integer.parseInt(contentLength);
                        } catch (NumberFormatException ex) {
                        }
                    }
                    String postLine = "";
                    char buf[] = new char[512];
                    int read = in.read(buf);
                    while (read >= 0 && size > 0 && !postLine.endsWith("\r\n")) {
                        size -= read;
                        postLine += String.valueOf(buf, 0, read);
                        if (size > 0) {
                            read = in.read(buf);
                        }
                    }
                    postLine = postLine.trim();
                    decodeParms(postLine, parms);
                }

                // Ok, now do the serve()
                Response r = serve(uri, method, header, parms);
                if (r == null) {
                    sendError(HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: Serve() returned a null response.");
                } else {
                    sendResponse(r.status, r.mimeType, r.header, r.data);
                }

                in.close();
            } catch (IOException ioe) {
                try {
                    sendError(HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
                } catch (Throwable t) {
                }
            } catch (InterruptedException ie) {
                // Thrown by sendError, ignore and exit the thread.
            }
        }

        /**
         * Decodes the percent encoding scheme. <br/>
         * For example: "an+example%20string" -> "an example string"
         */
        private String decodePercent(String str) throws InterruptedException {
            try {
                StringBuffer sb = new StringBuffer();
                for (int i = 0; i < str.length(); i++) {
                    char c = str.charAt(i);
                    switch (c) {
                        case '+':
                            sb.append(' ');
                            break;
                        case '%':
                            sb.append((char) Integer.parseInt(str.substring(i + 1, i + 3), 16));
                            i += 2;
                            break;
                        default:
                            sb.append(c);
                            break;
                    }
                }
                return new String(sb.toString().getBytes());
            } catch (Exception e) {
                sendError(HTTP_BADREQUEST, "BAD REQUEST: Bad percent-encoding.");
                return null;
            }
        }

        /**
         * Decodes parameters in percent-encoded URI-format
         * ( e.g. "name=Jack%20Daniels&pass=Single%20Malt" ) and
         * adds them to given Properties.
         */
        private void decodeParms(String parms, Properties p)
                throws InterruptedException {
            if (parms == null) {
                return;
            }

            StringTokenizer st = new StringTokenizer(parms, "&");
            while (st.hasMoreTokens()) {
                String e = st.nextToken();
                int sep = e.indexOf('=');
                if (sep >= 0) {
                    p.put(decodePercent(e.substring(0, sep)).trim(),
                            decodePercent(e.substring(sep + 1)));
                }
            }
        }

        /**
         * Returns an error message as a HTTP response and
         * throws InterruptedException to stop furhter request processing.
         */
        private void sendError(String status, String msg) throws InterruptedException {
            sendResponse(status, MIME_PLAINTEXT, null, new ByteArrayInputStream(msg.getBytes()));
            throw new InterruptedException();
        }

        /**
         * Sends given response to the socket.
         */
        private void sendResponse(String status, String mime, Properties header, InputStream data) {
            try {
                if (status == null) {
                    throw new Error("sendResponse(): Status can't be null.");
                }

                OutputStream out = mySocket.getOutputStream();
                PrintWriter pw = new PrintWriter(out);
                pw.print("HTTP/1.0 " + status + " \r\n");

                if (mime != null) {
                    pw.print("Content-Type: " + mime + "\r\n");
                }

                if (header == null || header.getProperty("Date") == null) {
                    pw.print("Date: " + gmtFrmt.format(new Date()) + "\r\n");
                }

                if (header != null) {
                    Enumeration e = header.keys();
                    while (e.hasMoreElements()) {
                        String key = (String) e.nextElement();
                        String value = header.getProperty(key);
                        pw.print(key + ": " + value + "\r\n");
                    }
                }

                pw.print("\r\n");
                pw.flush();

                if (data != null) {
                    byte[] buff = new byte[2048];
                    while (true) {
                        int read = data.read(buff, 0, 2048);
                        if (read <= 0) {
                            break;
                        }
                        out.write(buff, 0, read);
                    }
                }
                out.flush();
                out.close();
                if (data != null) {
                    data.close();
                }
            } catch (IOException ioe) {
                // Couldn't write? No can do.
                try {
                    mySocket.close();
                } catch (Throwable t) {
                }
            }
        }
        private Socket mySocket;
    };

    /**
     * URL-encodes everything between "/"-characters.
     * Encodes spaces as '%20' instead of '+'.
     */
    private String encodeUri(String uri) {
        String newUri = "";
        StringTokenizer st = new StringTokenizer(uri, "/ ", true);
        while (st.hasMoreTokens()) {
            String tok = st.nextToken();
            if (tok.equals("/")) {
                newUri += "/";
            } else if (tok.equals(" ")) {
                newUri += "%20";
            } else {
                newUri += URLEncoder.encode(tok);
                // For Java 1.4 you'll want to use this instead:
                // try { newUri += URLEncoder.encode( tok, "UTF-8" ); } catch ( UnsupportedEncodingException uee )
            }
        }
        return newUri;
    }
    private int myTcpPort;
    File myFileDir;

    // ==================================================
    // File server code
    // ==================================================
    /**
     * Serves file from homeDir and its' subdirectories (only).
     * Uses only URI, ignores all headers and HTTP parameters.
     */
    public Response serveFile(String uri, Properties header, File homeDir,
            boolean allowDirectoryListing) {
        // Make sure we won't die of an exception later
        if (!homeDir.isDirectory()) {
            return new Response(HTTP_INTERNALERROR, MIME_PLAINTEXT,
                    "INTERNAL ERRROR: serveFile(): given homeDir is not a directory.");
        }

        // Remove URL arguments
        uri = uri.trim().replace(File.separatorChar, '/');
        if (uri.indexOf('?') >= 0) {
            uri = uri.substring(0, uri.indexOf('?'));
        }

        // Prohibit getting out of current directory
        if (uri.startsWith("..") || uri.endsWith("..") || uri.indexOf("../") >= 0) {
            return new Response(HTTP_FORBIDDEN, MIME_PLAINTEXT,
                    "FORBIDDEN: Won't serve ../ for security reasons.");
        }

        File f = new File(homeDir, uri);
        if (!f.exists()) {
            return new Response(HTTP_NOTFOUND, MIME_PLAINTEXT,
                    "Error 404, file not found.");
        }

        // List the directory, if necessary
        if (f.isDirectory()) {
            // Browsers get confused without '/' after the
            // directory, send a redirect.
            if (!uri.endsWith("/")) {
                uri += "/";
                Response r = new Response(HTTP_REDIRECT, MIME_HTML,
                        "<html><body>Redirected: <a href=\"" + uri + "\">" +
                        uri + "</a></body></html>");
                r.addHeader("Location", uri);
                return r;
            }

            // First try index.html and index.htm
            if (new File(f, "index.html").exists()) {
                f = new File(homeDir, uri + "/index.html");
            } else if (new File(f, "index.htm").exists()) {
                f = new File(homeDir, uri + "/index.htm");
            } // No index file, list the directory
            else if (allowDirectoryListing) {
                String[] files = f.list();
                String msg = "<html><body><h1>Directory " + uri + "</h1><br/>";

                if (uri.length() > 1) {
                    String u = uri.substring(0, uri.length() - 1);
                    int slash = u.lastIndexOf('/');
                    if (slash >= 0 && slash < u.length()) {
                        msg += "<b><a href=\"" + uri.substring(0, slash + 1) + "\">..</a></b><br/>";
                    }
                }

                for (int i = 0; i < files.length; ++i) {
                    File curFile = new File(f, files[i]);
                    boolean dir = curFile.isDirectory();
                    if (dir) {
                        msg += "<b>";
                        files[i] += "/";
                    }

                    msg += "<a href=\"" + encodeUri(uri + files[i]) + "\">" +
                            files[i] + "</a>";

                    // Show file size
                    if (curFile.isFile()) {
                        long len = curFile.length();
                        msg += " &nbsp;<font size=2>(";
                        if (len < 1024) {
                            msg += curFile.length() + " bytes";
                        } else if (len < 1024 * 1024) {
                            msg += curFile.length() / 1024 + "." + (curFile.length() % 1024 / 10 % 100) + " KB";
                        } else {
                            msg += curFile.length() / (1024 * 1024) + "." + curFile.length() % (1024 * 1024) / 10 % 100 + " MB";
                        }

                        msg += ")</font>";
                    }
                    msg += "<br/>";
                    if (dir) {
                        msg += "</b>";
                    }
                }
                return new Response(HTTP_OK, MIME_HTML, msg);
            } else {
                return new Response(HTTP_FORBIDDEN, MIME_PLAINTEXT,
                        "FORBIDDEN: No directory listing.");
            }
        }

        try {
            // Get MIME type from file name extension, if possible
            String mime = null;
            int dot = f.getCanonicalPath().lastIndexOf('.');
            if (dot >= 0) {
                mime = (String) theMimeTypes.get(f.getCanonicalPath().substring(dot + 1).toLowerCase());
            }
            if (mime == null) {
                mime = MIME_DEFAULT_BINARY;
            }

            // Support (simple) skipping:
            long startFrom = 0;
            String range = header.getProperty("Range");
            if (range != null) {
                if (range.startsWith("bytes=")) {
                    range = range.substring("bytes=".length());
                    int minus = range.indexOf('-');
                    if (minus > 0) {
                        range = range.substring(0, minus);
                    }
                    try {
                        startFrom = Long.parseLong(range);
                    } catch (NumberFormatException nfe) {
                    }
                }
            }

            FileInputStream fis = new FileInputStream(f);
            fis.skip(startFrom);
            Response r = new Response(HTTP_OK, mime, fis);
            r.addHeader("Content-length", "" + (f.length() - startFrom));
            r.addHeader("Content-range", "" + startFrom + "-" +
                    (f.length() - 1) + "/" + f.length());
            return r;
        } catch (IOException ioe) {
            return new Response(HTTP_FORBIDDEN, MIME_PLAINTEXT, "FORBIDDEN: Reading file failed.");
        }
    }
    /**
     * Hashtable mapping (String)FILENAME_EXTENSION -> (String)MIME_TYPE
     */
    private static Hashtable theMimeTypes = new Hashtable();

    static {
        StringTokenizer st = new StringTokenizer(
                "htm		text/html " +
                "html		text/html " +
                "txt		text/plain " +
                "asc		text/plain " +
                "gif		image/gif " +
                "jpg		image/jpeg " +
                "jpeg		image/jpeg " +
                "png		image/png " +
                "mp3		audio/mpeg " +
                "m3u		audio/mpeg-url " +
                "pdf		application/pdf " +
                "doc		application/msword " +
                "ogg		application/x-ogg " +
                "zip		application/octet-stream " +
                "exe		application/octet-stream " +
                "class		application/octet-stream ");
        while (st.hasMoreTokens()) {
            theMimeTypes.put(st.nextToken(), st.nextToken());
        }
    }
    /**
     * GMT date formatter
     */
    private static java.text.SimpleDateFormat gmtFrmt;

    static {
        gmtFrmt = new java.text.SimpleDateFormat("E, d MMM yyyy HH:mm:ss 'GMT'", Locale.US);
        gmtFrmt.setTimeZone(TimeZone.getTimeZone("GMT"));
    }
    /**
     * The distribution licence
     */
    private static final String LICENCE =
            "Copyright (C) 2001,2005-2008 by Jarno Elonen <elonen@iki.fi>\n" +
            "\n" +
            "Redistribution and use in source and binary forms, with or without\n" +
            "modification, are permitted provided that the following conditions\n" +
            "are met:\n" +
            "\n" +
            "Redistributions of source code must retain the above copyright notice,\n" +
            "this list of conditions and the following disclaimer. Redistributions in\n" +
            "binary form must reproduce the above copyright notice, this list of\n" +
            "conditions and the following disclaimer in the documentation and/or other\n" +
            "materials provided with the distribution. The name of the author may not\n" +
            "be used to endorse or promote products derived from this software without\n" +
            "specific prior written permission. \n" +
            " \n" +
            "THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n" +
            "IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n" +
            "OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n" +
            "IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n" +
            "INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT\n" +
            "NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n" +
            "DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n" +
            "THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n" +
            "(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n" +
            "OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.";
}
